Merge pull request #42600 from nextcloud/backport/42559/stable28

[stable28] Remove unneeded styles: everything is handled by NcVue

Author: emoral435

core/css/server.css

@@ -34,8 +34,7 @@ html, body, div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pr
 }
 
 /** Let vue apps handle the focus themselves */
-.content:not(#content-vue) :focus-visible,
-.app-navigation:not(#app-navigation-vue) :focus-visible {
+.content:not(#content-vue) :focus-visible {
 	box-shadow: inset 0 0 0 2px var(--color-primary-element);
 	outline: none;
 }